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                                <h4 id="&#x4E00;&#x5143;&#x8FD0;&#x7B97;&#x7B26;">&#x4E00;&#x5143;&#x8FD0;&#x7B97;&#x7B26;</h4>
<p>&#x60A8;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x4E00;&#x5143;&#x8FD0;&#x7B97;<code>-</code>&#x7B26;&#x5C06;&#x6570;&#x5B57;&#x53D6;&#x53CD;&#xFF0C;&#x4F8B;&#x5982;<code>-234</code>&#x3002;&#x8981;&#x53D6;&#x53CD;&#x5E03;&#x5C14;&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>!</code>&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x4F8B;&#x5982;<code>!true</code>&#x3002;
&#x81EA;&#x589E;/&#x81EA;&#x51CF; <code>i++</code> &#x3001; <code>++i</code>&#x3001;<code>i--</code>&#x3001;<code>--i</code></p>
<h4 id="&#x7B97;&#x672F;&#x8FD0;&#x7B97;&#x7B26;">&#x7B97;&#x672F;&#x8FD0;&#x7B97;&#x7B26;</h4>
<p>&#x652F;&#x6301;&#x5E38;&#x89C1;&#x7684;&#x7B97;&#x672F;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x4F8B;&#x5982;<code>1 + 2 * 3 / 4 % 2</code>&#x3001;&#x540C;&#x6837;&#x4E5F;&#x652F;&#x6301;<code>+=</code>&#x3001;<code>-=</code>&#x3001;<code>*=</code>&#x3001;<code>/=</code>&#x3001;<code>%=</code></p>
<h4 id="&#x6BD4;&#x8F83;&#x8FD0;&#x7B97;&#x7B26;">&#x6BD4;&#x8F83;&#x8FD0;&#x7B97;&#x7B26;</h4>
<p><code>23 &lt; 34</code>&#xFF0C;<code>23 &lt;= 34</code>&#xFF0C;<code>23 &gt; 34</code>&#xFF0C;<code>23 &gt;= 34</code>&#xFF0C;<code>true != false</code>&#xFF0C;<code>23 == 34</code></p>
<p>&#x6BD4;&#x8F83;&#x8FD0;&#x7B97;&#x7B26;&#x7ED3;&#x679C;&#x4E3A;<code>boolean</code>&#x7C7B;&#x578B;</p>
<h4 id="&#x903B;&#x8F91;&#x8FD0;&#x7B97;&#x7B26;">&#x903B;&#x8F91;&#x8FD0;&#x7B97;&#x7B26;</h4>
<p>&#x9664;&#x4E86;&#x4E00;&#x5143;&#x8FD0;&#x7B97;<code>!</code>&#x7B26;&#xFF0C;&#x60A8;&#x8FD8;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>&amp;&amp;</code>&#x548C;<code>||</code>&#x3002;&#x5C31;&#x50CF;Java&#x4E2D;&#x4E00;&#x6837;&#xFF0C;&#x8FD0;&#x7B97;&#x7B26;&#x4E5F;&#x662F;&#x4E00;&#x79CD;&#x77ED;&#x8DEF;&#x8FD0;&#x7B97;&#x7B26;&#x3002;&#x5982;&#x679C;<code>&amp;&amp;</code>&#x5DE6;&#x8FB9;&#x8BA1;&#x7B97;&#x4E3A;<code>false</code>&#xFF0C;&#x5219;&#x4E0D;&#x4F1A;&#x8BA1;&#x7B97;&#x53F3;&#x8FB9;&#x3002;&#x5982;&#x679C;<code>||</code>&#x5DE6;&#x4FA7;&#x4E3A;true&#xFF0C;&#x5219;&#x4E0D;&#x4F1A;&#x8BA1;&#x7B97;&#x53F3;&#x8FB9;
&#x5728;1.3.0+&#x7248;&#x672C;&#x4E2D;&#x589E;&#x5F3A;&#x4E86;<code>&amp;&amp;</code> <code>||</code> &#x4E0D;&#x5728;&#x5F3A;&#x5236;&#x4E24;&#x8FB9;&#x5FC5;&#x987B;&#x662F;&#x5E03;&#x5C14;&#x7C7B;&#x578B;&#x3002;&#x4F5C;&#x7528;&#x4E0E;<code>JS</code>&#x4E00;&#x6837;</p>
<h4 id="&#x4E09;&#x5143;&#x8FD0;&#x7B97;&#x7B26;">&#x4E09;&#x5143;&#x8FD0;&#x7B97;&#x7B26;</h4>
<p>&#x4E09;&#x5143;&#x8FD0;&#x7B97;&#x7B26;&#x662F;<code>if</code>&#x8BED;&#x53E5;&#x7684;&#x7B80;&#x5199;&#x5F62;&#x5F0F;&#xFF0C;&#x5176;&#x5DE5;&#x4F5C;&#x65B9;&#x5F0F;&#x7C7B;&#x4F3C;&#x4E8E;Java&#x4E2D;&#xFF0C;&#x4F8B;&#x5982;<code>true ? &quot;yes&quot; : &quot;no&quot;</code>
&#x5728;1.2.7+&#x7248;&#x672C;&#x4E2D;&#xFF0C;&#x589E;&#x5F3A;&#x4E86;<code>if</code> &#x548C;&#x4E09;&#x5143;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x4E0D;&#x5728;&#x5F3A;&#x5236;&#x503C;&#x5FC5;&#x987B;&#x662F;&#x5E03;&#x5C14;&#x7C7B;&#x578B;&#xFF0C;&#x53EF;&#x4EE5;&#x5199;<code>if(xxx)</code>&#x7684;&#x5F62;&#x5F0F;&#x5F53;<code>xxx</code>&#x4E3A;&#x4EE5;&#x4E0B;&#x60C5;&#x51B5;&#x65F6;&#x4E3A;<code>fasle</code>&#x3001;&#x5176;&#x5B83;&#x60C5;&#x51B5;&#x4E3A;<code>true</code></p>
<ul>
<li><code>null</code></li>
<li>&#x7A7A;&#x96C6;&#x5408;</li>
<li>&#x7A7A;Map</li>
<li>&#x7A7A;&#x6570;&#x7EC4;</li>
<li>&#x6570;&#x503C;==0</li>
<li>&#x975E;&#x7A7A;&#x5B57;&#x7B26;&#x4E32;</li>
<li><code>false</code></li>
</ul>
<h4 id="&#x7C7B;&#x578B;&#x8F6C;&#x6362;">&#x7C7B;&#x578B;&#x8F6C;&#x6362;</h4>
<p>&#x53EF;&#x4F7F;&#x7528;<code>::type(defaultValue)</code> &#x7684;&#x65B9;&#x5F0F;&#x8FDB;&#x884C;&#x7C7B;&#x578B;&#x8F6C;&#x6362;&#xFF0C;&#x5982;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> a = <span class="hljs-string">&quot;123&quot;</span>::int; <span class="hljs-comment">// 123</span>
<span class="hljs-keyword">var</span> b = <span class="hljs-string">&quot;abc&quot;</span>::int(<span class="hljs-number">111</span>); <span class="hljs-comment">// 111</span>
<span class="hljs-keyword">var</span> c = <span class="hljs-string">&quot;2020-01-01&quot;</span>::date(<span class="hljs-string">&apos;yyyy-MM-dd&apos;</span>); <span class="hljs-comment">// &#x8F6C;&#x6362;&#x4E3A;date</span>
</code></pre>
<h4 id="&#x53EF;&#x9009;&#x94FE;&#x64CD;&#x4F5C;&#x7B26;">&#x53EF;&#x9009;&#x94FE;&#x64CD;&#x4F5C;&#x7B26;</h4>
<p>&#x53EF;&#x9009;&#x94FE;&#x64CD;&#x4F5C;&#x7B26;(<code>?.</code>)&#x5141;&#x8BB8;&#x8BFB;&#x53D6;&#x4F4D;&#x4E8E;&#x8FDE;&#x63A5;&#x5BF9;&#x8C61;&#x94FE;&#x6DF1;&#x5904;&#x7684;&#x5C5E;&#x6027;&#x7684;&#x503C;&#xFF0C;&#x800C;&#x4E0D;&#x5FC5;&#x660E;&#x786E;&#x9A8C;&#x8BC1;&#x94FE;&#x4E2D;&#x7684;&#x6BCF;&#x4E2A;&#x5F15;&#x7528;&#x662F;&#x5426;&#x6709;&#x6548;&#x3002;<code>?.</code>&#x64CD;&#x4F5C;&#x7B26;&#x7684;&#x529F;&#x80FD;&#x7C7B;&#x4F3C;&#x4E8E;<code>.</code>&#x94FE;&#x5F0F;&#x64CD;&#x4F5C;&#x7B26;&#xFF0C;&#x4E0D;&#x540C;&#x4E4B;&#x5904;&#x5728;&#x4E8E;&#xFF0C;&#x5728;&#x5F15;&#x7528;&#x4E3A;&#x7A7A; &#x7684;&#x60C5;&#x51B5;&#x4E0B;&#x4E0D;&#x4F1A;&#x5F15;&#x8D77;&#x9519;&#x8BEF;&#xFF0C;&#x8BE5;&#x8868;&#x8FBE;&#x5F0F;&#x77ED;&#x8DEF;&#x8FD4;&#x56DE;&#x503C;&#x662F; <code>null</code>&#x3002;</p>
<p>&#x5F53;&#x5C1D;&#x8BD5;&#x8BBF;&#x95EE;&#x53EF;&#x80FD;&#x4E0D;&#x5B58;&#x5728;&#x7684;&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x65F6;&#xFF0C;&#x53EF;&#x9009;&#x94FE;&#x64CD;&#x4F5C;&#x7B26;&#x5C06;&#x4F1A;&#x4F7F;&#x8868;&#x8FBE;&#x5F0F;&#x66F4;&#x77ED;&#x3001;&#x66F4;&#x7B80;&#x660E;&#x3002;&#x5728;&#x63A2;&#x7D22;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x7684;&#x5185;&#x5BB9;&#x65F6;&#xFF0C;&#x5982;&#x679C;&#x4E0D;&#x80FD;&#x786E;&#x5B9A;&#x54EA;&#x4E9B;&#x5C5E;&#x6027;&#x5FC5;&#x5B9A;&#x5B58;&#x5728;&#xFF0C;&#x53EF;&#x9009;&#x94FE;&#x64CD;&#x4F5C;&#x7B26;&#x4E5F;&#x662F;&#x5F88;&#x6709;&#x5E2E;&#x52A9;&#x7684;&#x3002;</p>
<pre><code class="lang-javascript">obj?.prop
obj?.method(args)
</code></pre>
<p>&#x793A;&#x4F8B;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> a = <span class="hljs-literal">null</span>;
<span class="hljs-keyword">var</span> b = a?.name;    <span class="hljs-comment">// b = null;</span>
<span class="hljs-keyword">var</span> c = a?.getName();   <span class="hljs-comment">// c = null;</span>
</code></pre>
<h4 id="&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;">&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;</h4>
<p>&#x6269;&#x5C55;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x53C8;&#x53EB;&#x5C55;&#x5F00;&#x8BED;&#x6CD5;(Spread syntax)&#xFF0C; &#x662F;&#x7528;&#x4E8E;&#x5C06;list&#x6216;map&#x5728;&#x8BED;&#x6CD5;&#x5C42;&#x9762;&#x5C55;&#x5F00;&#xFF1B;</p>
<p>&#x8BED;&#x6CD5;:</p>
<blockquote>
<p>lambda &#x8C03;&#x7528;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> sum = (a,b,c) =&gt; a + b + c;
System.out.println(sum(...[<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-number">3</span>]))
<span class="hljs-comment">/*
&#x7ED3;&#x679C;&#xFF1A;6
*/</span>
</code></pre>
<p>list &#x5C55;&#x5F00;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> arr = [<span class="hljs-number">3</span>,<span class="hljs-number">4</span>,<span class="hljs-number">5</span>];
System.out.println([<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,...arr,<span class="hljs-number">6</span>,<span class="hljs-number">7</span>])
<span class="hljs-comment">/*
&#x7ED3;&#x679C;&#xFF1A;[1, 2, 3, 4, 5, 6, 7]
*/</span>
</code></pre>
<p>list &#x5C55;&#x5F00;&#x5230; map &#x4E2D;
```javascript
var arr = [3,4,5];
System.out.println({key1:1,...arr})
/*
&#x7ED3;&#x679C;&#xFF1A;{key1=1, 0=3, 1=4, 2=5}</p>
</blockquote>
<p>&#x867D;&#x7136;&#x8FD9;&#x4E9B;key&#x770B;&#x8D77;&#x6765;&#x50CF;&#x6570;&#x503C;&#xFF0C;&#x4F46;&#x5176;&#x5B9E;&#x662F;String&#x7C7B;&#x578B;&#x7684;key&#xFF0C;&#x5982;&#x679C;&#x628A;&#x5B83;&#x4EEC;&#x8F6C;&#x4E3A;JSON&#x770B;&#x8D77;&#x6765;&#x662F;&#x8FD9;&#x6837;&#x7684;&#xFF1A;</p>
<p>{&quot;key1&quot;:1, &quot;0&quot;:3, &quot;1&quot;:4, &quot;2&quot;:5}</p>
<p>*/</p>
<pre><code>
&gt; map &#x5C55;&#x5F00;
```javascript
var map = {key2:2}
System.out.println({key1:1,...map,key3:3})
/*
&#x7ED3;&#x679C;&#xFF1A;{key1=1, key2=2, key3=3}
*/
</code></pre>
                                
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